Sulfur Dioxide (1971) Designated Area Design Values

Data is current as of November 30, 2025
Design Values in ppb. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

Display:       Nonattainment and Maintenance Areas       Nonattainment Areas       Maintenance Areas

Click underlined column heading to change report order	Current Design Values as of 06/08/2020 (2019)
Area Name	Annual Design Values	24-Hour Design Values	Meets NAAQS Determin.1	Current Status	class sort	Current Designation or at Redesignation	2010 Population
click area name for state/county list
Ajo (Pima County), AZ				Maintenance	A	Primary	8,823
Allegheny County Air Basin: Hazelwood monitor, PA				Maintenance	A	Primary	387,190
Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA				Nonattainment	A	Primary	4,516
Benton County; (part) TVA Johnsonville, TN				Maintenance	B	Primary, Secondary	16,489
Boyd County (part), KY				Maintenance	A	Primary	49,543
Brown County: Green Bay, WI				Maintenance	A	Primary	248,004
Central Steptoe Valley, NV				Maintenance	A	Primary	2,165
Colbert County (part); TVA Colbert Plant, AL				Maintenance	C	Secondary	54,429
Coshocton County; Franklin Township, OH				Maintenance	A	Primary	1,229
Cuyahoga County, OH				Maintenance	A	Primary	996,159
Dane County: Madison sub-city area, WI				Maintenance	A	Primary	488,074
Douglas (Cochise County), AZ				Maintenance	A	Primary	17,495
East Helena Area, MT				Maintenance	B	Primary, Secondary	2,669
Gallia County; Addison Township, OH				Maintenance	C	Secondary	2,197
Grant County, NM				Maintenance	A	Primary	29,514
Hancock County (part): Weirton, WV				Maintenance	B	Primary, Secondary	15,801
Hayden (Pinal County), AZ	5	33	Yes	Nonattainment	A	Primary	4,844
Humphreys County; (part) TVA Johnsonville, TN				Maintenance	B	Primary, Secondary	18,539
Jefferson County; (part) Steubenville & Mingo Junction, OH				Maintenance	A	Primary	69,712
La Porte County, IN				Maintenance	A	Primary	111,471
Lake County, IN				Maintenance	A	Primary	496,000
Lake County; (part) Eastlake, Timberlake, Lakeline, Willoughby, Ment				Maintenance	A	Primary	229,760
Lauderdale County (part); TVA Colbert Plant, AL				Maintenance	C	Secondary	92,707
Laurel Area (Yellowstone County), MT				Nonattainment	A	Primary	6,525
Lorain County, OH				Maintenance	A	Primary	301,074
Lucas County, OH				Maintenance	A	Primary	441,812
Marathon County: Rothschild Sub-city area, Rib Mountain, Weston, WI				Maintenance	B	Primary, Secondary	134,064
Marion County: Lawrence, Washington, and Warrant Townships, IN				Maintenance	A	Primary	349,929
Miami (Gila County), AZ				Maintenance	A	Primary	1,514
Millinocket AQCR 109, ME				Maintenance	A	Primary	5,526
Milwaukee, WI				Maintenance	A	Primary	947,779
Minneapolis-St. Paul, MN				Maintenance	A	Primary	2,849,567
Morenci (Greenlee County), AZ				Maintenance	A	Primary	8,437
Morgan County: Center Township, OH				Maintenance	C	Secondary	15,053
Muhlenberg County, KY				Maintenance	C	Secondary	31,499
Muscatine County, IA				Maintenance	A	Primary	24,633
New Manchester-Grant magisterial district in Hancock County, WV				Maintenance	A	Primary	8,706
Olmsted County; City of Rochester, MN				Maintenance	A	Primary	106,769
Oneida County: Rhinelander Sub-city area, WI				Maintenance	B	Primary, Secondary	35,996
Peoria County: Hollis twp, IL				Maintenance	B	Primary, Secondary	2,032
Peoria, IL				Maintenance	A	Primary	127,507
Piti, GU				Nonattainment	A	Primary	1,000
Polk County, TN				Maintenance	B	Primary, Secondary	16,825
Salt Lake County, UT	1	2	Yes	Nonattainment	B	Primary, Secondary	1,029,655
San Manual (Pinal County), AZ				Maintenance	A	Primary	16,158
Tanguisson, GU				Nonattainment	A	Primary	1,000
Tazewell County: Groveland twp, IL				Maintenance	A	Primary	22,991
Tooele County, UT				Nonattainment	B	Primary, Secondary	58,218
Vigo County, IN				Maintenance	A	Primary	107,848
Warren County, NJ				Maintenance	B	Primary, Secondary	108,696
Warren County: Conewago Twp, PA				Maintenance	A	Primary	3,594
Warren County: Warren Boro, Pleasant Twp, Glade Twp, PA				Maintenance	B	Primary, Secondary	15,781
Washington County: Waterford Township, OH				Maintenance	C	Secondary	61,777
Wayne County: Boston, Center, Franklin, Wayne & Webster Townships, I				Maintenance	A	Primary	52,325

¹ See the Air Quality Design Value site spreadsheet footnotes for information about "Insufficient Data" Meets NAAQS Determinations.
Design Values in ppb. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

Multi-state areas are counted in maintenance totals when all states in the area have been redesignated.

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